Honestly, Kelly, it's like anything else, you just get so it rolls off your back. When people ask me how I am, I usually say, "Eh, you know. Nothing special to report here." When they suggest/imply that I'm milking it, I just tell them that they're right and that I suck. If I get the line about medicine not working, I say, "You're right, why don't you fix it?"
Basically, I no longer allow any wiggle room. I simply don't care what they think anymore. I don't say "I can't", I say "No." and if it's not good enough, I let them dangle in their own awkward silence. It works, believe me!